The former 'Friends' actress has welcomed her co-star onto Instagram after she finally joined the photo sharing platform this week by posting a selfie with the rest of the cast.

Alongside a snap of the two pals smiling together, she wrote: "Hi Jen! Welcome to the social media world. it sucks. You're gonna love it!"

The 50-year-old star made sure her debut on the photo-sharing site on Tuesday was memorable by uploading a shot of the 'Friends' cast - including Courteney, Lisa Kudrow, Matt LeBlanc, Matthew Perry and David Schwimmer - during a recent reunion to celebrate 25 years since the sitcom aired.

Although he immediately commented on her picture, Justin is yet to follow her.

Jennifer hinted earlier this week that she was thinking about joining Instagram.

She teased: "[On social media] you can actually have a little bit more control over the narrative that's out there. [You can] right some wrongs and some silly things that, God knows, are said often. Maybe [I'll join]. You never know."

However, once people got wind that she had joined the popular website, the application crashed temporarily due to the high number of follower requests.

In just four hours, the 'Horrible Bosses' star had gained 300 000 followers.

Meanwhile, Jennifer spoke about the cast reunion during a recent interview and said they laughed "a lot" during the "civilised" dinner at Courteney's house.

She said: "Schwimmer was in town and we all happened to have a window of time so we all got together. We laughed so hard."